A method and device for loading a catalyst into a chamber. The catalyst loading is well suited for production of hydrogen producing microreactors. The catalyst is coated onto a strip which is mountable within the chamber.
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7. A microreactor comprising:
a reaction chamber;
a combustion chamber;
a plurality of spaced apart catalyst coated strips within at least one of the reaction chamber and combustion chamber; at least one inlet port in the reaction chamber;
at least one outlet port in the reaction chamber;
at least one inlet port in the combustion chamber;
at least one outlet in the combustion chamber; and,
at least one flow channel formed between spaced apart catalyst coated strips;
wherein the at least one flow channel is mesoscale.
8. A microreactor comprising:
a reaction chamber;
a combustion chamber;
a plurality of spaced apart catalyst coated strips within at least one of the reaction chamber and combustion chamber;
at least one inlet port in the reaction chamber;
at least one outlet port in the reaction chamber;
at least one inlet port in the combustion chamber;
at least one outlet in the combustion chamber; and,
at least one flow channel formed between spaced apart catalyst coated strips;
wherein the at least one flow channel is serpentine.
1. A microreactor comprising:
a reaction chamber;
a combustion chamber;
a plurality of spaced apart catalyst coated strips within at least one of the reaction chamber and combustion chamber;
at least one inlet port in the reaction chamber;
at least one outlet port in the reaction chamber;
at least one inlet port in the combustion chamber; and,
at least one outlet in the combustion chamber;
wherein each of the catalyst coated strips further comprises:
a substantially planar-strip of a base substrate with a mounting means;
a catalyst support affixed to the base substrate on both sides of the strip; and
a catalyst coated onto the catalyst support.
2. The microreactor of
4. The microreactor of
5. The microreactor of
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This application is a divisional of U.S. patent application Ser. No. 10/404,882, filed on Mar. 31, 2003 now U.S. Pat. No. 7,220,699, the contents of which are incorporated by reference herein in its entirety.
1. Field of the Invention
The present invention generally relates to the chemical arts generally to a method and device for loading a catalyst into chambers, more particularly to loading a catalyst into chambers associated with a small reactor which may be a microreactor. One microreactor which this method and device is suitable for is a microreactor for generating hydrogen gas by decomposing or reforming a hydrocarbon fuel.
2. Background of the Invention
The growing popularity of portable electronic devices has produced an increased demand for compact and correspondingly portable electrical power sources to energize these devices. Developments in robotics and other emerging technology applications are further increasing the demand for small, independent power sources.
At present, storage or rechargeable batteries are typically used to provide independent electrical power sources for portable devices. However, the amount of energy that can be stored in storage or rechargeable batteries is insufficient to meet the need of certain applications.
Fuel cells have potential as a replacement for some batteries. Because they can operate on very energy-dense fuels, fuel cell-based power supplies offer high energy-to-weight ratios compared with batteries. Fuel cells are of particular interest to the military, where significant efforts are being made to reduce the weight of power supplies that soldiers must carry to support high-tech, field-portable equipment. There is also considerable potential for utilizing fuel cell-based power supplies for commercial applications, particularly for portable applications, where small size and low weight are desirable.
A common fuel cell is a polymer electrolyte membrane fuel cell (PEMFC). PEMFC's are constructed of an anode and a cathode separated by a polymer electrolyte membrane. The polymer electrolyte membrane is also known in the industry as a proton exchange membrane Functionally, fuel cells generate electricity by stripping an electron off hydrogen and allowing the charged proton H+ to pass through the proton exchange membrane while the electron e-travels around the proton exchange membrane thereby producing a voltage.
The charged hydrogen proton then reacts with atmospheric oxygen to produce water. In some applications, generally smaller PEMFC under about 2 KW, the PEMFC can function as an “air-breather” (see generally U.S. Pat. No. 6,117,577 issued to Wilson). In an air-breather oxygen can typically be obtained from the ambient atmosphere, only a source of hydrogen must be provided to operate the fuel cell.
Hydrogen supplied to such a fuel cell can be provided in a gaseous form from a tank of hydrogen, or it can be generated by reformation. However, providing compressed hydrogen is not always a viable option, because of the substantial volume that even a highly compressed gas occupies. Liquid hydrogen, which occupies less volume, is a cryogenic liquid, and a significant amount of energy is required to achieve the extremely low temperatures required to liquefy gaseous hydrogen.
The hydrogen supply can also be generated by a steam reforming method or a partial oxidation method, using as feedstock hydrocarbons such as LPG, naphtha, gasoline, kerosene, alcohol, coal or natural gas composed principally of methane or non-hydrocarbons such as ammonia.
Catalysts are commonly used to facilitate reformation of hydrocarbons within a reactor. Catalysts are also often used to facilitate the combustion in a combustion chamber of a microreactor to supply thermal energy for the reformation process.
Incorporation of catalysts into a microreactors is commonly done by either packing the catalyst particles or pellets into a chamber, into cut channels in a chamber, or catalyst coating the walls of cut channels in a chamber. Metal foams, screens, mesh and wires are also commonly used as a support substrate for catalysts. However, one limitation of metal foam supported catalyst is the tortuous flow pattern created and the pressure drops and resistance associated therewith. Also, the incorporation of a catalyst coated metal foam substrate necessitates intimate contact between the foam and the reactor body to provide good heat transfer.
Another feature beneficial to a microreactor is a structure wherein flow channels are provided in the reactor to facilitate the flow of gases over the catalyst while minimizing pressure drop, and facilitating heat transfer.
Flow channels can be machined with CNC or EDM milling. However, both have limitations with the aspect ratios (length/height) that can be achieved. EDM is also an expensive technique not well-suited for mass production.
Therefore, it is a desideratum to provide a method and device for catalyst loading into a chamber such as a reactor, it is also a desideratum to provide a method and device for catalyst incorporation into a chamber, which provides for flow channels without expensive CNC or EDM milling.
Now in accordance with this invention there has been found a method and device for incorporating a catalyst into a chamber. The chamber may be a part of a microreactor. The chamber may be a combustion or reaction chamber in a microreactor.
A method of loading a catalyst on a mountable strip formed of a base substrate with a catalyst support; the catalyst support coated with at least catalyst. The strip being mountable in a chamber. The strips of uncoated base substrate and catalyst support may, in some instances, be mounted into a chamber and then coated with
A method of loading catalysts into a chamber, whereby catalyst loaded strips mate into a mounting, protrusions, clasps, cavities, catches, slots, grove, channel, catch or latch in the a chamber. The chamber can be sealed or sealable and unsealable.
A chamber, which can communicate via one or more ports, loaded with mountable catalyst coated strip. The strips can be formed of a metallic base substrate with a catalyst support material, including but not limited to alumina, silica, zirconia and ceria, affixed thereto and coated with at least one catalyst.
Two or more strips can be mounted with the chamber, in a predetermined configuration to form flow channels. The flow channel may be meso-scale, straight, serpentine or have straight or serpentine regions.
Other features and advantages of the present invention will be set forth, in part, in the descriptions which follow and the accompanying drawings, wherein the preferred embodiments of the present invention are described and shown, and in part, will become apparent to those skilled in the art upon examination of the following detailed description taken in conjunction with the accompanying drawings or may be learned by practice of the present invention. The advantages of the present invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appendent claims.
The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:
It should be appreciated that for simplicity and clarity of illustration, elements shown in the Figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements are exaggerated relative to each other for clarity. Further, where considered appropriate, reference numerals have been repeated among the Figures to indicate corresponding elements.
Particular embodiments of the invention are described below in considerable detail for the purpose for illustrating its principles and operation. However, various modifications may be made, and the scope of the invention is not limited to the exemplary embodiments described. For example, while specific reference is made to microreactors, or hydrogen generators that employ natural gas or methane as a hydrocarbon fuel supply, it can be appreciated that this process is also of utility for using other hydrogen rich fuels such as propane, butane, LPG, gasoline, Jet fuel, diesel; renewables such as soybean oil, soydiesel; oxygenates such as methanol, ethanol; and ammonia.
An exemplary catalyst loaded strip 10 is shown in
Mounting legs 30 are not the exclusive means by which the catalyst loaded metal strips may be loaded.
The catalyst can be coated onto the strip by a number of different process including but not limited to, wet impregnation, spray coating, and chemical vapor deposition. Preferably, as shown in
The embodiment in
Catalysts loaded metal strips 10 (
One application of one or more microreactors 100 with catalyst 20 loaded metal strips 10 is to facilitate the production of hydrogen for use in fuel cell powered devices. The preferred metal substrate for such strips is stainless steel 316 or Inconel 600 when the reactor operating temperature is between 300 to 650 C. and aluminum when the temperature is below 300 C.
Hydrogen supplied to such a fuel cell can be generated by a steam reforming using as feedstock hydrocarbons such as LPG, naphtha, gasoline, kerosene, alcohol, coal or natural gas composed principally of methane or non hydrocarbons such as ammonia or oxygenates such as methanol.
The steam reforming method includes both a reforming reaction and a water gas shift reaction. The reforming reaction results in the production of a substantial amount of carbon monoxide, as well as hydrogen and carbon dioxide. It is known to include a water gas shift reactor which causes the carbon monoxide product to react with water. The carbon monoxide concentration in the shifted gas can be reduced down to several thousands ppm. By proper choice of catalysts and reaction conditions, it is possible to reduce the carbon oxide concentration to below 10%, and more preferably below 5% (on a dry basis).
However, even with this reduction, the residual carbon monoxide concentration is often too great for the hydrogen gas to bee supplied to a PEMFC and the hydrogen gas must be further treated by selective oxidation, or methantion or the like, to remove additional carbon monoxide.
Following are the reaction equations for the steam reforming method, where methane is the feedstock. Equations 1 and 2 (steam reforming) illustrate the reforming reaction, while Equation 3 illustrates the water gas shift reaction.
CH4+H2O→CO+3H2 Equation 1
CH4+2H2O→CO2+4H2 Equation 2
CO+H2O→CO2+H2 Equation 3
CO+2H2→CH4 Equation 4
These reactions are reversible, exhibit large variations in equilibrium composition depending on temperatures, and require high temperatures to achieve sufficiently high reaction rates.
The reforming reaction is an endothermic reaction, carried out at a temperature of 6000.degree. C. or higher. For heating, it is known to combust part of the feedstock and to utilize the resulting combustion heat. In contrast, the water gas shift reaction (equation 3) is an exothermic reaction, so that lower temperatures are advantageous for reducing the concentration of carbon monoxide.
In both the steam reforming reactor and the water gas shift reactor catalysts can be loaded pursuant to the device via the method described herein. Catalysts for steam reforming of hydrocarbons, such as nickel- or noble metal based catalysts, are readily available from a variety of sources. For example, the catalyst division of Johnson Matthey, in Wayne, Pa., provides suitable catalysts.
Catalysts for the water gas shift are copper-zinc catalysts, other copper-based catalysts, or noble metal compositions that include components such as gold and platinum are available from a variety of sources.
Shown in
One benefit of using the strips 10 is the ability to create substantially parallel channels 200, shown in
The reaction chamber has a reaction chamber inlet 70 (
The microreactor 100 can be fabricated from a variety of nonrefactory metals, such as metal alloys, having good thermal conductivity. Representative metals include titanium and stainless steel. The temperature conditions, in particular, determine the type of materials that can be used in fabricating the reactor (conventional metals, such as heat resistive stainless steel, for temperatures less than 650.degree. C., or refractory metals for higher temperatures). For example, the reforming reaction of natural gas is commonly performed at about 700 to 800.degree. C. By selecting the appropriate catalyst for incorporation in the metal strips a reactor which can reform natural gas at or below 650 C., which therefore allows for construction of less expensive stainless steel may be achieved. Reforming at lower temperatures is advantageous when a hydrogen separation membrane is incorporated into the microreactor 100. The simultaneous separation of hydrogen removes equilibrium limitations and allows for improved hydrogen production rates (via higher conversion of the fuel source) at lower temperatures. In the case of water gas shift reactors in which the operating temperatures may be below 300 C., microreactor 100 can be fabricated from copper or aluminum.
Preferably, the hydrogen separation membrane 300 comprises a material, that can be used to separate hydrogen from a mixed product stream of hydrogen, unreacted hydrocarbons, carbon monoxide, carbon dioxide and other dilutents, such as pure palladium or alloys of palladium. Preferably, the membrane 300 has a thickness of between about 5 to 20 microns, and more preferably between about 5 and about 10 microns
When the hydrogen separation membrane is a thin foil (for example commercial Pd/Ag alloy foil, which is about 25 microns thick, the foil is affixed to the porus region 310 to form a leak tight assembly using gaskets or by using brazing, or welding techniques that include, but not limited to laser welding.
In another embodiment for the incorporation of catalyst into a chamber, a serpentine flow pattern as indicated by the arrows shown in
Compaction of a microreactor 100 can benefit from placing the reaction chamber and combustion chamber adjacent to one another to provide a thermal transfer (
in
To generate hydrogen, the microreactor 100 fuel is directed into the combustion chamber and an ignition source is provided to start and/or drive the combustion of the fuel. The heat of combustion is transferred to the reaction chamber 45 via the thin metal floor 50 which acts as a thermal transfer conduit 150. The increased surface area afforded by the metal strips is beneficial to the thermal transfer from the combustion chamber to the reaction chamber as the metal floor 50 with strips mounted on each side behaves as a finned heat exchanger.
The catalyst loading method and device described herein can be applied to a wide variety of reaction chambers and combustion chambers.
For example, in a compact microreactor 100, a catalyst combustion reaction occurring in a combustion chamber 45 can transfer the thermal energy to the reaction chamber 40 (via the thermal transfer conduit 150). The catalysts in the chambers function under different temperature conditions, each catalyst having a characteristic “light-off” temperature (a minimum required temperature below which little or no catalytic activity is observed), as well as a characteristic optimal temperature.) A combustion fuel is added to the combustion chamber 45 thorough a combustion inlet 85 (
Downstream from the hydrogen separation unit, a filter 97 may be placed to further purify the hydrogen gas by remaining non-hydrogen compounds; for example, traces of CO can be removed via the methanation reaction (equation 4) that is conducted below 400 C. The filter is another chamber which may also contain a catalyst to filter out the non-hydrogen compounds. The catalyst for example a methanation may be loaded into the filter 97 in the manner described herein. This method of catalyst coatings is particularly well suited for reactions such as the methanation reaction, whose reaction rate is strongly diffusion-limited.
Although the present invention has been described in connection with the preferred form of practicing it, those of ordinary skill in the art will understand that many modifications can be made thereto without departing from the spirit of the present invention. Accordingly, it is not intended that the scope of the invention in any way be limited by the above description.
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